Having a pre-made adventure around makes a GM's life easier. They can basically just "grab and go" and they've got some sessions already put together. Sprinkle in some game-specific items here and there and your players may never know that you used one. Well, Dread Swamp of the Banshee is just such an adventure that's up on Kickstarter now.
From the campaign:
Downstream from the village of Silt is a great marsh created by a massive flood long ago. Many treasures were lost and now lay buried in the ruins of these cursed and water soaked lands. There are rumors that smugglers and criminals hide their felonious activities and great wealth here, but there is more to fear in the mist than the designs of men. For something sinister lurks in the darkness of the bogs. Find your courage, sharpen your blade, trust no one and you may just survive the Dread Swamp of the Banshee.
The campaign's more than 11x funded with 13 days left to go.